linux-kernel - Re: [RFC PATCH v2 09/14] mtd: nand: add sunxi NFC dt bindings doc

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Date:	Wed, 29 Jan 2014 11:11:34 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Boris BREZILLON <b.brezillon.dev@...il.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Brian Norris <computersforpeace@...il.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mtd@...ts.infradead.org, dev@...ux-sunxi.org
Subject: Re: [RFC PATCH v2 09/14] mtd: nand: add sunxi NFC dt bindings doc

On Wed, Jan 29, 2014 at 8:34 AM, Boris BREZILLON
<b.brezillon.dev@...il.com> wrote:
> Add the sunxi NAND Flash Controller dt bindings documentation.
>
> Signed-off-by: Boris BREZILLON <b.brezillon.dev@...il.com>
> ---
>  .../devicetree/bindings/mtd/sunxi-nand.txt         |   46 ++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/sunxi-nand.txt
>
> diff --git a/Documentation/devicetree/bindings/mtd/sunxi-nand.txt b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
> new file mode 100644
> index 0000000..b0e55a3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
> @@ -0,0 +1,46 @@
> +Allwinner NAND Flash Controller (NFC)
> +
> +Required properties:
> +- compatible : "allwinner,sun4i-nand".
> +- reg : shall contain registers location and length for data and reg.
> +- interrupts : shall define the nand controller interrupt.
> +- #address-cells: shall be set to 1. Encode the nand CS.
> +- #size-cells : shall be set to 0.
> +- clocks : shall reference nand controller clocks.
> +- clock-names : nand controller internal clock names. Shall contain :
> +    * "ahb_clk" : AHB gating clock
> +    * "sclk" : nand controller clock
> +
> +Optional children nodes:
> +Children nodes represent the available nand chips.
> +
> +Optional properties:

For the controller or per nand chip?

> +- onfi,nand-timing-mode : mandatory if the chip does not support the ONFI
> +  standard.

Add to generic nand binding.

> +- allwinner,rb : shall contain the native Ready/Busy ids.
> + or
> +- rb-gpios : shall contain the gpios used as R/B pins.

Isn't allwinner,rb implied by a lack of rb-gpios property. Or no R/B
pin is an option? If so, don't you need some fixed time delay
properties like max erase time?

rb-gpios could be added to the generic nand binding as well.

Rob
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